Multiple-speed gearing



(No Model.) v3 sheetssheet 1..

B. P. BURDICK. MULTIPLE SPBBP GEARING.

` Patented Apr. 23, 1895.

(No Model.) 3 Sheets-Sheet 2.V B. I'. BURDIGK.

MULTIPLE SPEED GBARING.

1\In.'537,816.` Patented Apr. 23, 1895.

THE Nonms PErEns C0. PHOTD-UTHDJwAsl-mrm DA C.

(No Model.) 3 Sheets-Sheet 3. EE. BUEDIGK.

MULTIPLE SPEED EEAEING.A

W. GSSCS BENJAMIN F BURDICK, OF LITTLE GENESEE, NEV YORK.

MULTIPLE-speel) GEARING.

SPECIFICATION forming part of Letters Patent No. 537,816, dated April23, 1895. Application tiled October 19, 1894. l Serial No. 526,376. (Nomodel.)

To @ZZ whom t may concern:

' Beit known that I, BENJAMIN F. BURDICK, a citizen of the UnitedStates, residing at Little Genesee, in the county of Allegany and Stateof New York, have invented a new and useful Multiple-Speed Gearing, ofwhich the following is a specification.

My invention relates to m ultiple speed gear-l ing designed for use inconnection with wood and metal worklng machinery, requiring variablefeed movement, the objects in view be ing to provide means forcommunicating motion from a continuously rotating shaft or member havinga uniform speed to feed `mechanism for operating a carriage or feedrolls adapted to support or co-operate with cutting or shaping devices,a single multiple gearing being employed for wood working machines whiledouble gearing is desirable for metal working apparatus. 4

Further objects and advantages of the invention will appear in thefollowing description, and the novel features thereof will beparticularly pointed out in the appended claims. v

In the drawings-Figure lis a side view of a multiple speed gearingapparatus embodying my invention, applied in the operative p0- sition toa lathe. Fig. 2 is a central longitudinal section of the same, takenparallel with and in the plane of the axes of the adjustable disks, onthe line 2-2 of Fig. 3. Fig. 3 is a front view of the device showing theouter disk of the table partly broken away. Fig. 4 is a view of theinner disk of the table to show the annular gear whereby motion iscommunicated thereto from the operating pinion. Fig. 5 is a rear view ofthe device with the outer disk of the table partly broken away. Fig. 6is a transverse section of the rear table on the line 6-6 of Fig. 5.Fig. 7 is a detail view of the disk locking mechanism.

Similar numerals of reference indicate corresponding parts in all thefigures of the drawings. I have shown the apparatus embodying myinvention applied in operative position to a lathe, wherein l designatesa bed, upon suitable guides 2, of which, is mounted a carriage 3. 4represents the head-stock in which is mounted a mandrel 5, and 6represents a tailstock of the usual or any preferred construction. Themandrel is provided with the usual cone-pulley 7, to which motion iscommunicated through a belt, (not shown.) The means for operating thecarriage consists, in the construction illustrated, of a feed-screw 8,operating in a nut 9 on the carriage, and arranged in a suitable bearingor bearings l0, adjacent to the head-stock, said feed-screw beingprovided at the end adjacent to the head-stock with a gear 1l.

The head-stock is recessed or chambered in its opposite sides, and in abearing l2 formed in the web 13 separating said chambers is mounted theintermediate shaft 14, arranged parallel with and between the mandreland the feed screw. This intermediate or counter shaft is provided atits opposite extremities with large gears l5 and 16, arrangedrespectively in front and in rear of the head stock and adapted to beconnected, respectively, by suitable means, hereinafter described, tothe mandrel and the feed screw. Such means of connection preferablyconsist of trains of gears interposed respectively between the mandreland the gearl and between the feed screw and the gear 16.

The gearing for communicating motion from the mandrel to the gear 15,preferably comprises a pinion 17 fixed to the mandrel, a double gear 18comprising the gear members 19 and 20, which are of different sizes, andone of which is in mesh with the gear l5, and an intermediate gear 21which communicates motion from the pinion on the mandrel to that memberof the double gear which is not in mesh with said gear 15. Thisintermediate gear is permanently in engagement with the pinion on themandrel, and, therefore, rotates at a uniform speed, the relation ofwhich, to that of the mandrel is in a ratio regulated by the relativesizes of said pinion and. gear. Inasmuch, however, as the members of thedouble gear, above described, are of different sizes or diameters, androtate synchronously,

the gear 15 will be rotated at a different speed from the intermediategear, and hence from the mandrel, the difference being in accordancewith the various relative diameters of the several gears forming thetrain by which motion is communicated from the mandrelto the gear 15.

In order to provide for changing the speed seams of the gear 15, or ofthe shaft to which it is fixed, with relation to that of the mandrel, Iemploya series of double gears, the members of which have differentrelative sizes, and this series of double gears I arrange upon arotatable table 22, which is mounted eccentrically with relation to theintermediate shaft, whereby either of the double gears may be arrangedin position between the gear 15 and the mandrel, whereby its memberswill mesh, respectively, with the said gear 15 and the intermediategear.

The table preferably consists of parallel disks 23 and 24, of which theouter disk 23 is provided with a central opening 25, as shown clearly inthe drawings, to expose the main gear 15. The double gears are mountedupon spindles between the planes of the inner and outer plates or disks,and the inner plate or disk is provided with a seriesof peripheralnotches 26, for engagement by a catch or locking device 27, to hold thetable in any one of its various adjusted positions. This catch mayconsist, as shown in the drawings, of an intermediately pivoted leverprovided at one endwith a stud 2S, to engage said notches in the innerplate or disk, and provided at the other end with a knob 29, whichprojects outward beyond the cylindrical casing or shell 30, whichextends around the edges of the plates or disks and protects the doublegears from accumulation of dust. The inner disk is also provided with anannular gear 31, with which meshes a pinion 32, on the end of a spindle33, said spindle being mounted kin suitable bearings 34 in a planeparallel with that of the disk, and being provided at its outerextremity with a wrench seat 35, whereby it may be rotated to adjust thetable. rIhe table is provided with a central sleeve 36, which is mountedrotatably upon a boss 37, in which is formed the bea-ring for thecounter shaft, said boss being eccentric with relation to the saidbearing. Said cylindrical casing or shell is provided at a suitablepoint with an opening 38, and the periphery of the rotary table isprovided with a series of numerals or other characters which designatethe various double gears carried thereby, and the character relating toa given double gear is exposed through said opening in the cylinder orshell when said double gear is in operative relation with the gears ofthe counter shaft and the mandrel. In this way the desired adjustment ofthe mechanism may be attained with facility. The casing or shell isremovably fitted upon a flange 39, projecting from the head stock., andis temporarily secured thereto by means of pivotal catches or hooks 40,engaging registering,perforations in the shell and the iiange.

The means for communicating motion from the counter shaft to the feedscrew consists of a main gear 16 on the counter shaft, the gear 11 onthe feed screw, and the intermediate train of gears comprising anintermediate gear 41, meshing with said gear 11, and mounted upon afixed spindle, and one of a series of double gears 42, corresponding ingeneral construction, arrangement,and function with those hereinbeforedescribed, and carried by a rotary table 43, also corresponding inconstruction with that above described.

The means for mounting and operating the table 43 are similar to thosedescribed in connection with the table carrying the double gears whichcommunicate motion from the mandrel to the counter shaft, and thereforea specific description thereof is unnecessary.

The obj ect in employing substantially dnplicate sets of gearing forcommunicating motion, respectively, from the mandrel to a counter shaft,and from the counter shaft to the feed screw, consists in the fact thatagreater variety of relative speeds of the feed screw may be attained.With only a single series of double gears such as that carried by one ofthe rotary tables, the feed screw may be 'turned at a certain speed foreach double gear,

and hence the number of different speeds will be in accordance with thenumber of double gears in use, but when two sets of double gears,arranged upon independently rotatable tables and adapted to be used inany desired combination, are employed, the feed screw may be rotated atany one of a number of relative speeds equal to the m ultiple of thenumber of gears carried by the two tables.

In connection with the above described apparatus, I preferably employ ascale or index 44, showing the relative speed of the feed gear withdifferent combinations of the double gears carried by the rotary tables.

The multiple gearing as above described may be applied to a greatvariety ofwood and metal working machines,including turning andscrew-cutting lathes, planing, milling, drilling and other machines, andit will be obvious that in practice various changes in the form,proportion and minordetails of construction may be resorted to withoutdeparting from the spirit or sacrificing vany of the advantages of thisinvention.

Inasmuch as the apparatus, as described, may be applied toa number ofdifferent classes of machines in which different terms are applied tothe various shafts or spindles, I have not confined myself in the claimsto those which are used in connection with a lathe. For instance, themandrel may be replaced by any driving shaft which receives motion froma source of power, while the counter shaft and feed-screw occupy thepositions and perform the functions of driven shafts. When only onedriven shaft is employed a single train of gearing is necessary, ashereinbefore indicated, but when a greater Variety of changes in thespeed of the driven shaft is required, a second driven, or anintermediate, shaft is employed between the driving and driven shafts.This IOO IIO

intermediate shaft is driven by the driving shaft through the firsttrain of gears, and communicates motion through the second train ofgears to the driven shaft.

Having described my invention, What I claim is- 1. In combination With adriving shaft and a driven shaft provided with gears, of a series ofdouble gears for communicating motion from the gear on the driving shaftto the gear on the driven shaft, a rotary table carrying said series ofdouble gears and consisting of parallel spaced disks or plates betweenwhich said gears are arranged, the rotary table being mountedeccentrically with relation to the driven shaft, and means for lockingthe table at the desired adjustment, substantially as specified.

2. The combination with a driving and a driven shaft carrying gears, ofrotary tables mounted eccentrically with relation to the driven shaftand provided with series of double gears to mesh with the gears on thedriven shaft, the gears on one of the tables being adapted to mesh alsowith the gear on the driving shaft, and a second driven shaft having agear to mesh With the double gears on the other table, substantially asspecified.

3. The combination with a driving and a driven shaft having gears, of arotary table mounted eccentrically with relation to one of said shaftsand carrying a plurality of double gears, either of which may bearranged in operative relation with the gears of the driving and drivenshafts, to communicate motion from the former to the latter, and annulargear on the table, a spindle arranged parallel with the plane of thetable and having a pinion to mesh with the annular gear thereof, andmeans for locking the table at the desired adjustment, substantially asspecified.

4. The combination with a driving and a driven shaft having gears, arotary table mounted eccentrically with relation to one of said shaftsand provided Witha series of double gears, either of which may bearranged in operative relation with the gears of the driving and drivenshafts, for communicating motion from the former to the latter, saidltable being provided with a peripheral series of charactersrepresenting the several double gears, a shell or casing inclosing thetable and provided with an opening through which one of said characterson the table may be viewed, said opening being arranged in such aposition as to expose the character of a given double gear when saidgear is in operative position, and means for locking the table at thedesired adj ustment,substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two Witnesses.

BENJAMIN F. BURDICK.

Witnesses: v

S. D. WELLS, J. B. PRINDLE.

